<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <button id="b">111</button>

    <script>


        // 如果标签上添加了 disabled  那么绑定的事件也会失效



        b.onclick = function () {
            // alert(1)
            // b.disabled = true;

            // this就是代表b
            this.disabled = true;
        }

    </script>

</body>

</html>